uvm_fault(0xffffffff83a12a48, 0xffff80001ac72090, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 218335 22001 0 0 0 0 syz-executor *384881 27093 0 0x2 0x1 1K syz-executor ffs2_balloc(fffffd806c57b5f0,7aeab,50,fffffd80097fd410,1,ffff80002a35e7d8) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a35e860) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd8063537d08,ffff80002a35e910,3,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffef4d8,fffffd8063537d08,fffffd80097fd410,ffff80002a35e9e0,ffff80002a35e9c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002a35eb60) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a35eb60) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77d4c69d9370, count: 8 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff83a12a48, 0xffff80001ac72090, 0, 1) -> d ddb{1}> trace ffs2_balloc(fffffd806c57b5f0,7aeab,50,fffffd80097fd410,1,ffff80002a35e7d8) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a35e860) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd8063537d08,ffff80002a35e910,3,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffef4d8,fffffd8063537d08,fffffd80097fd410,ffff80002a35e9e0,ffff80002a35e9c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002a35eb60) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a35eb60) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77d4c69d9370, count: -7 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a35e780 rbx 0 rdx 0 rcx 0xffff80001ac72000 rax 0x12 r8 0xffffffffffffffff r9 0xffff80002a35e7d8 r10 0x937b67e96914b4ec r11 0xa5f9c0574cbb59c5 r12 0x1 r13 0xffff800000c31800 r14 0xffff80002a35e610 r15 0xfffffd80603b36b0 rip 0xffffffff8209720d ffs2_balloc+0xa0d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a35e600 ss 0x10 ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 ddb{1}> show proc PROC (syz-executor) tid=384881 pid=27093 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=69, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffef770,0xffff8000fffeefb8 process=0xffff8000ffff44d8 user=0xffff80002a359000, vmspace=0xfffffd800b0637a0 estcpu=36, cpticks=7, pctcpu=0.1, user=0, sys=7, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86002 404935 78584 0 2 0 syz-executor 22001 218335 46268 0 7 0 syz-executor 22001 512499 46268 0 2 0x4000000 syz-executor 15704 227806 27093 0 2 0 syz-executor 15704 401786 27093 0 3 0x4000080 fsleep syz-executor 11048 24896 50677 -1 2 0x10 syz-executor 11048 140208 50677 -1 3 0x4000090 kqsel syz-executor 11048 342564 50677 -1 3 0x4000090 fsleep syz-executor 97058 433169 59354 0 3 0x100082 sbwait arp 59354 37404 90748 0 3 0x10008a sigsusp sh 78584 484772 87838 0 3 0x82 nanoslp syz-executor 90748 82009 87838 0 3 0x82 wait syz-executor *27093 384881 87838 0 7 0x3 syz-executor 65127 466295 87838 0 3 0x82 wait syz-executor 85616 7259 87838 0 3 0x82 wait syz-executor 43552 440070 87838 0 3 0x82 wait syz-executor 46268 504237 87838 0 3 0x82 nanoslp syz-executor 50677 36938 87838 0 3 0x82 nanoslp syz-executor 87838 260249 18277 0 3 0x82 kqread syz-executor 18277 345504 17709 0 3 0x10008a sigsusp ksh 17709 328568 55548 0 3 0x98 kqread sshd-session 55548 197486 37920 0 3 0x92 kqread sshd-session 74865 380352 1 0 3 0x100083 ttyin getty 37920 520411 1 0 3 0x88 kqread sshd 43973 457169 49595 74 3 0x1100092 bpf pflogd 49595 246008 1 0 3 0x80 sbwait pflogd 46680 190565 68902 73 3 0x1100090 kqread syslogd 68902 385595 1 0 3 0x100082 sbwait syslogd 96610 234179 1 0 3 0x100080 kqread resolvd 13356 418027 80256 77 3 0x100092 kqread dhcpleased 73117 111029 80256 77 3 0x100092 kqread dhcpleased 80256 209329 1 0 3 0x80 kqread dhcpleased 34045 454258 0 0 3 0x14200 bored smr 95843 252059 0 0 3 0x14200 pgzero zerothread 85895 284464 0 0 3 0x14200 aiodoned aiodoned 13401 211712 0 0 3 0x14200 syncer update 24841 353837 0 0 3 0x14200 cleaner cleaner 21988 53754 0 0 3 0x14200 reaper reaper 12808 406864 0 0 3 0x14200 pgdaemon pagedaemon 68648 290651 0 0 3 0x14200 bored viomb 3198 413408 0 0 3 0x40014200 acpi0 acpi0 17828 388784 0 0 3 0x40014200 idle1 80897 142523 0 0 3 0x14200 bored softnet1 10649 194459 0 0 3 0x14200 bored softnet0 27820 171354 0 0 3 0x14200 smrbar systqmp 24993 265611 0 0 3 0x14200 bored systq 82356 489678 0 0 3 0x14200 tmoslp softclockmp 32946 453419 0 0 3 0x40014200 tmoslp softclock 56751 427490 0 0 3 0x40014200 idle0 1 36866 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27093 (syz-executor) thread 0xffff8000fffef4d8 (384881) exclusive rrwlock inode r = 0 (0xfffffd806c57b690) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ktrwriteraw+0x175 sys/kern/kern_ktrace.c:688 #7 ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] #7 ktrsysret+0x192 sys/kern/kern_ktrace.c:209 #8 syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #8 syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a32f00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] #1 ktrsysret+0xde sys/kern/kern_ktrace.c:209 #2 syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #2 syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 #3 Xsyscall+0x128 Process 27820 (systqmp) thread 0xffff8000ffffe000 (171354) shared rwlock systqmp r = 0 (0xffffffff83953178) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11069 12146K 12351K 166960K 12349 0 pcb 17 12K 12K 166960K 40 0 rtable 231 7K 7K 166960K 360 0 pf 34 17K 19K 166960K 54 0 ifaddr 41 7K 7K 166960K 46 0 ifgroup 52 2K 2K 166960K 62 0 sysctl 3 1K 9K 166960K 73 0 counters 70 37K 37K 166960K 76 0 ioctlops 0 0K 4K 166960K 1571 0 iov 0 0K 8K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1299 82K 82K 166960K 1519 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 93K 166960K 230 0 proc 71 115K 164K 166960K 561 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 18 0 in_multi 89 6K 6K 166960K 93 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 392 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 161K 170K 166960K 3889 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 45 90K 108K 166960K 1368 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 12 0K 1K 166960K 28 0 temp 45 9079K 9143K 166960K 8029 0 kqueue 13 20K 24K 166960K 43 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 43 0 39 1 0 1 1 0 8 0 rtentry 176 107 0 4 5 0 5 5 0 8 0 unpcb 144 66 0 49 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 28 0 22 1 0 1 1 0 8 0 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 127 0 116 2 0 2 2 0 8 0 nd6 152 22 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 0 1 1 0 8 1 pppxif 1576 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 25 0 1 1 0 1 1 0 8 0 pfstkey 128 25 0 1 1 0 1 1 0 8 0 pfstate 448 25 0 1 3 0 3 3 0 8 0 pfrule 1360 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 419 0 6 27 0 27 27 0 8 1 art_table 40 420 0 6 5 0 5 5 0 8 0 art_node 32 105 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 6 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1809 0 343 92 0 92 92 0 8 0 ffsino 296 1809 0 343 114 0 114 114 0 8 0 nchpl 144 2140 0 442 64 0 64 64 0 8 0 vnodes 216 1953 0 0 109 0 109 109 0 8 0 namei 1024 6794 0 6794 2 0 2 2 0 8 2 percpumem 16 53 0 3 1 0 1 1 0 8 0 kstatmem 264 30 0 4 2 0 2 2 0 8 0 scxspl 216 10878 0 10878 4 3 1 3 1 8 1 plimitpl 152 47 0 30 1 0 1 1 0 8 0 sigapl 424 545 0 496 7 0 7 7 0 8 0 knotepl 120 292 0 0 9 0 9 9 0 8 0 kqueuepl 224 52 0 42 1 0 1 1 0 8 0 pipepl 344 129 0 102 3 0 3 3 0 8 0 fdescpl 528 529 0 496 3 0 3 3 0 8 0 filepl 160 2264 0 2039 12 0 12 12 0 8 2 lockfpl 104 39 0 36 1 0 1 1 0 8 0 lockfspl 48 19 0 16 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 398 0 384 1 0 1 1 0 8 0 zombiepl 144 499 0 496 1 0 1 1 0 8 0 processpl 1232 545 0 496 5 0 5 5 0 8 0 procpl 664 715 0 662 6 0 6 6 0 8 0 sockpl 752 240 0 208 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 170 0 0 11 0 11 11 0 8 0 bufpl 280 6535 0 242 450 0 450 450 0 8 0 anonpl 32 7637 0 0 62 0 62 62 0 246 0 amapchunkpl 152 11488 0 10996 27 0 27 27 0 158 5 amappl16 200 2293 0 2270 16 2 14 14 0 8 10 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 430 0 428 1 0 1 1 0 8 0 amappl13 176 120 0 107 1 0 1 1 0 8 0 amappl12 168 840 0 809 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 1 0 1 0 8 0 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 104 0 101 1 0 1 1 0 8 0 amappl7 128 156 0 142 1 0 1 1 0 8 0 amappl6 120 158 0 155 1 0 1 1 0 8 0 amappl5 112 94 0 83 1 0 1 1 0 8 0 amappl4 104 286 0 264 1 0 1 1 0 8 0 amappl3 96 2100 0 1982 4 0 4 4 0 8 0 amappl2 88 530 0 465 2 0 2 2 0 8 0 amappl1 80 9697 0 9064 16 0 16 16 0 8 1 amappl 88 3161 0 2995 5 0 5 5 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 529 0 496 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 529 0 496 1 0 1 1 0 8 0 vmmpekpl 168 6048 0 6015 2 0 2 2 0 8 0 vmmpepl 168 41928 0 39938 98 0 98 98 0 357 2 vmsppl 488 528 0 496 5 0 5 5 0 8 0 rwobjpl 80 15063 0 13975 28 0 28 28 0 8 1 pdppl 4096 1065 0 992 99 24 75 85 0 8 2 pvpl 32 15221 0 0 123 0 123 123 0 265 0 pmappl 256 528 0 496 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 269 0 27 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83920ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83a32700) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a32700) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7d65394b67d0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83920ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83a32700) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a32700) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7d65394b67d0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 ffs2_balloc(fffffd806c57b5f0,7aeab,50,fffffd80097fd410,1,ffff80002a35e7d8) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a35e860) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd8063537d08,ffff80002a35e910,3,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffef4d8,fffffd8063537d08,fffffd80097fd410,ffff80002a35e9e0,ffff80002a35e9c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002a35eb60) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a35eb60) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77d4c69d9370, count: 8 ddb{1}> trace ffs2_balloc(fffffd806c57b5f0,7aeab,50,fffffd80097fd410,1,ffff80002a35e7d8) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a35e860) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd8063537d08,ffff80002a35e910,3,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffef4d8,fffffd8063537d08,fffffd80097fd410,ffff80002a35e9e0,ffff80002a35e9c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef4d8,5b,0,ffff80002a35eab0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002a35eb60) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a35eb60) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77d4c69d9370, count: -7